how to move multiple objects into the centre of a circle
My apologies for the fast gifs, but one way since the spokes are separate objects is to create one and offset it's Y axis if you need to (but you don't have to). 



Then set the cursor to a center point in object mode and rotate the objects around it (alt + d).



Select one object and go into edit mode. Select the tip of the spoke and drag using the Y axis. It will maintain it's size and go towards the center.



Then you can make the objects one object (ctrl + j).

EDIT: Just found an even faster way if all objects are combined and you're selecting ONLY the edges...
Simply:  (Alt + s)